Why electricity in India is in the multiples of 11 like 11kv, 22kv, 33kv ?

Transformer Induced voltage equation contains 4.44 factor.
E -Induced emf per phase
T -number of turns
f -frequency
phi -maximum flux per pole
From the equation we see that E is proportional to 4.4 and it is in turn multiple of 11.
So always transmission voltage is multiple of 11


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